Dentosphere : World of Dentistry

# Streptococcus mutans is involved in dental caries initiation. Other bacteria also involved is: A. S. sarcinus B. S. macae C. S. sanguis D.S. salivarius # The dietary carbohydrate most likely involved in etiology of dental caries is : A. Glucose B. Sucrose C. Dextran D. Polysaccharide # Bacteria responsible for initiation of caries is : A. Actinomyces B. Streptococcus mutans C. Lactobacillus D. Streptococcus viridans # What is the pH at which initiation of caries begins? A. 4.3-4.5 B. 5.2-5.5 C. 4.9-5.1 D. 3.5-4.5 # Oral foci of Miller's are seen in : A. Dental caries B. Lichen planus C. Herpes simplex D. Syphilis # In the earliest stages of carious lesion, there is loss of : A. Enamel cuticle B. Interprismatic substance C. Organic matrix D. Enamel lamellae # Smooth surface caries is characterized by spread of carie...

# Lactobacilli are numerous in carious lesions because they: A. Are the main causative agent B. Can produce insoluble extracellular polysaccharides C. Can attach to smooth enamel surfaces D. Are secondary invaders # Starch is considered to be less cariogenic than monosaccharides and disaccharides because it A. Does not diffuse through plaque B. is rapidly hydrolysed in the mouth C. enhances remineralisation D. raises the pH in the oral cavity

# Morphological stages of tooth development are explained based upon: A. Shape of enamel organ B. Shape of tooth germ C. Functions of enamel organ D. Shape of dental papilla # The disturbances occured during "calcification" stage of tooth development is seen in: A. Peg laterals B. Microdontia C. Supernumerary tooth D. Interglobular dentin # Tooth develops from: A. Ectoderm, mesoderm B. Ectoderm C. Mesoderm D. Ectoderm and endoderm # Which of the following is not an ectomesenchymal derivative? A. Dentin B. Cementum C. Pulp D. Enamel # The relationship between the pulpal and periodontal tissue complex beegins during dental development at: A. Adolescent stage B. 5-10 years C. Embryonic stage D. None of the above # In cap stage, regulating factor for cusp shape formation is present in: A. Dental papilla B. Dental follicle C. Inne...

# High levels of albumin is present in: A. Inner enamel epithelium B. Outer enamel epithelium C. Stellate reticulum D. Stratum intermedium # Nutrition for ameloblasts after the first layer of enamel is formed is: A. Dental sac B. Odontoblastic process C. REE D. Dental Papilla # Membrana preformativa is seen in: A. Bell stage B. Cap stage C. Bud stage D. Advanced bell stage # Enamel pearls are found in: A. Occlusal surface of premolars B. Furcation areas of permanent molars C. On the incisal edges of incisors D. None of the above # Which statement is correct ? A. Enamel cannot form in absence of dentin B. The formation of enamel and dentin are independent of each other C. Enamel formation can occur in absence of dentin D. None of the above # Atypical or osteodentin is formed due to disturbance during : A. Morphodifferentiation B. Histodiff...

# The formation of the dental lamina is initiated by: A. Forebrain B. Rathke's Pouch C. Neural Crest Cells D. Odontoblasts # Accessory canals result from : A. Defects in cementogenesis B. Dividing epithelial bridges C. Break in Hertwig's root sheath D. Adherent epithelial rests # The Hertwig's epithelial root sheath is essential to development of the root because it: A. Gives rise to cementoblasts that produce cementum of the root B. Moulds the shape of roots and stimulates differentiation of odontoblasts C. Gives rise to odontoblasts that lay dentin of thee root D. Remains as an essential constituent of the periodontal ligament # A supernumerary tooth results from a deviation during: A. Initiation B. Differentiation C. Apposition D. Calcification # Which of the following anomalies occur during the initiation and proliferation of tooth development ? A. Amelog...

# The bud, cap and bell stage of the developing tooth are based on growth of the: A. Stellate reticulum B. Dental papilla C. Enamel organ D. Dental sac # Dental lamina is active up to : A. 1 year B. 2 years C. 4 years D. 5 years

# Gnarled enamel is seen in : A. Proximal surface of tooth B. Cervicl region of tooth C. Cusp tips of tooth D. All of the above # The key hole pattern appearance in the cross section is a feature of : A. Aprismatic enamel B. Prismatic enamel C. Intertubular dentin D. Intratubular dentin # Neonatal lines are seen in : A. Enamel of deciduous incisors B. Enamel of permanent incisors C. Enamel of premolars D. Dentin of all teeth as it is formed first # The shallow furrows on the enamel surface where Striae of Retzius end are known as: A. Cracks B. Pellicle C. Perikymata D. Enamel lamellae # Maximum amount of phosphate is seen in: A. Bone B. Enamel C. Gingiva D. Dentin # Dark bands that are present in enamel rods at intervals of 4 micrometers are: A. Neonatal Bands B. Cross striations C. Striae of Retzius D. Hunter Schreger ban...